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Summary

• Motion of bodies with constant acceleration a
• Freely Falling Bodies: a = 9.8 m/s2 in vertical direction We can approximate as a = 10 m/s2
• Demonstration: The feather and the penny
• Examples of problems and solutions
• Projectiles - Motion in 2 dimension
• Demonstrations: "2 ball drop"; "Shoot the Monkey"
• Galileo’s principles
• Principle of inertia
• Principle of superposition
• Foundations for Newton’s laws
• Consequence for our world view
• There is NO absolute position
• There is NO absolute vellocity
• All positions and velocities are RELATIVE
• No reason to say the earth is at rest; no reason to place the earth at the center
• Next Time: Astronomy from early Greek period to Kepler: Ptolomy, Copernicus, Galileo, ...
• How was the distance to the sun measured 300 years BC?!
• Is the earth at the center? How do you know?
• Read for Next Time: March 4; Timeline linked on the class homepage.